<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>用户管理</el-breadcrumb-item>
      <el-breadcrumb-item>用户列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="消息提示的文案" type="info" center show-icon :closable="false"></el-alert>
      <!-- 进度条 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <!-- 纵向tab标签页 -->
        <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 级联选择器 -->
              <el-cascader :options="catelist" :props="catProps" v-model="addForm.goods_cat" @change="handleChanged"
                clearable change-on-select></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :ket="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload :action="uploadUrl" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture"
              :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
          <el-tab-pane label="完成" name="5">完成</el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'
  export default {
    data() {
      return {
        activeIndex: '0',
        // 添加商品的表单数据对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          goods_cat: [],
          // 图片的数组
          pics: [],
          // 商品的详情描述
          goods_introduce: '',
          attrs: []
        },
        //表单验证规则
        addFormRules: {
          goods_name: [{
            required: true,
            message: '请输入活动名称',
            trigger: 'blur'
          }],
          goods_price: [{
            required: true,
            message: '请输入活动价格',
            trigger: 'blur'
          }],
          goods_weight: [{
            required: true,
            message: '请输入活动重量',
            trigger: 'blur'
          }],
          goods_number: [{
            required: true,
            message: '请输入活动数量',
            trigger: 'blur'
          }],
          goods_cat: [{
            required: true,
            message: '请输入活动数量',
            trigger: 'blur'
          }]
        },
        // 商品分类列表
        catelist: [],
        // 指定级联选择器的配置对象
        catProps: {
          // 具体选定的值的属性(根据后台接口文档)
          value: 'cat_id',
          // 你所看到的是那个属性
          label: 'cat_name',
          // 指定父子嵌套用的是哪个属性
          children: 'children',
          //指定交互方式
          expandTrigger: 'hover'
        },
        //动态参数列表数据
        manyTableData: [],
        // 静态属性列表数据
        onlyTableData: [],
        // 上传图片的后台接口地址
        uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
        // 图片上传组件的headers请求头对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: '',
        previewVisible: false
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      //获取所有商品的分类数据
      async getCateList() {
        const {
          data: res
        } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          this.$message.error('获取商品分类失败')
        }
        this.catelist = res.data
      },
      // 级联选择器选中项变化时触发这个函数
      handleChanged() {
        // console.log(this.addForm.goods_cat)
        if (this.addForm.goods_cat.length !== 3) {
          this.addForm.goods_cat = []
        }
      },
      //标签页变化会触发此函数
      beforeTabLeave(activeName, oldActiveName) {
        if (oldActiveName == '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类')
          return false
        }
      },
      //tab被选中时将会触发这个事件
      async tabClicked() {
        if (this.activeIndex === '1') {
          const {
            data: res
          } = await this.$http.get(`categories/${this.cateId}/attributes`, {
            params: {
              sel: 'many'
            }
          })
          if (res.meta.status !== 200) {
            return this.$message.error('获取参数失败')
          }
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
          console.log(this.manyTableData)
        } else if (this.activeIndex === '2') {
          const {
            data: res
          } = await this.$http.get(`categories/${this.cateId}/attributes`, {
            params: {
              sel: 'only'
            }
          })
          if (res.meta.status !== 200) {
            return this.$message.error('获取参数失败')
          }
          this.onlyTableData = res.data
          // console.log(this.onlyTableData = res.data)
        }
      },
      // 处理图片预览
      handlePreview(file) {
        // console.log(file)
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      // 监听图片上传成功的事件
      handleSuccess(response) {
        // console.log(response)
        // 1.拼接得到一个图片信息对象
        const picInfo = {
          pic: response.data.tmp_path
        }
        console.log(picInfo)
        // 2，将图片信息对象push到pics数组中
        this.addForm.pics.push(picInfo)
        // console.log(this.addForm)
      },
      handleRemove(file) {
        // 1.获取将要删除的图片路径
        const filePath = file.response.data.tmp_path
        // 从pic数组中找到这个图片对应的索引
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
        this.addForm.pics.splice(i, 1)
        // console.log(this.addForm)
      },
      add() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) {
            return this.$message.error('请填写必要的表单项！')
          }
          // 执行添加的业务逻辑
          // lodash   cloneDeep(obj)
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          console.log(form)

          // 发起请求添加商品
          // 商品的名称，必须是唯一的
          const { data: res } = await this.$http.post('goods', form)

          if (res.meta.status !== 201) {
            return this.$message.error('添加商品失败！')
          }

          this.$message.success('添加商品成功！')
          this.$router.push('/goods')
        })
      }
    },
    computed: {
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style lang="less" scoped>
  .el-checkbox {
    margin: 0 10px 10px 0 !important;
  }

  .previewImg {
    width: 100%;
  }

  .btnAdd {
    margin-top: 15px;
  }
</style>
